I'm sure that blogging is narcisstic

I'm Jong-young from Korea. Maybe I'm in the best English class now. I've never used blog before. I know it's shameful.
By the way, I think blogging is narcissistic. Why? I'm sure that people can't post their status or opinions on a blog if they are shy or don't have enough confidence. Just imagine that you are a shy guy and you have to make a speech in front of thousands of people. Could you make it? Never. Of course on a blog, you don't need to show your face, however a lot of people, even more than a thousand, can see your thought. To me, it's obviously true that only confident people can post their status on blog. For this reason, blogging is narcissistic.